성별 : 생일 : 키/몸무게 :
Koyomi is Jun'ichi's homeroom teacher, one of the faculty's science teachers, and Kotori's older sister. She is also a researcher at the Amakase Laboratory, and in charge of the Miharu android. In the Second Season, she is a new mother, and her strict composure rapidly crumbles when she talks about her baby.